DeSantis is trying a bit there to be the adult in the room, which was effective for him last debate when he derailed a question about climate change, but isn't as effective this time around.

-Jacob Rubashkin, 538 Contributor

Ramaswamy brings up one of his key stump speech issues, ending "birthright" citizenship for people who are born on American soil. It's one of the ideas Trump championed in his campaign and earlier presidency — a bit of showing his hand here as he tacks to be the default Trump replacement in the case that he ends up dropping out of the race.

— Analysis by G. Elliott Morris of 538

Republican primary voters are further to the right on many immigration issues than the general electorate. They support building a border wall, increasing border patrols, and defunding sanctuary cities. In 2020, the last presidential election year, 62 percent opposed a path to citizenship for undocumented immigrations. Ending birthright citizenship, as Ramaswamy says he wants to do, is even more extreme. Candidates tonight are trying to woo those voters tonight with their stances on immigration, but they risk boxing themselves into unpopular opinions should they make it to the general election.
— Analysis by Monica Potts of 538

DeSantis gets a question on China and says he wants a totally new approach to that country. He says that he wants to ban the Chinese Communist Party from buying land anywhere in America, and also says he doesn't want them in our universities. It wasn't clear if he was talking about all Chinese students, or just the Confucius Institutes he mentioned right after.

—Jacob Rubashkin, 538 contributor

Foreign policy isn’t quite dominating this debate, but U.S. policy towards China is a prominent theme, and Ramaswamy is bearing down a lot of attacks on that.

Ramaswamy and Haley had a heated moment on the debate stage over the issue of support for Ukraine – which Haley tied to China. When Ramaswamy argued against support for Ukraine, Haley jumped in, saying that a win for Russia is a win for China, and then accused Ramaswamy of liking China.

There was also the memorable TikTok exchange between the two. Haley sniped at Ramaswamy that "every time I hear you, I feel a little bit dumber for what you say” and that he can't be trusted as he justified his choice to join TikTok after being convinced by influencer and boxer Jake Paul to join despite previously calling it "digital fentanyl." TikTok was created by Chinese company ByteDance and lawmakers have scrutinized the app over security concerns. (Ads for TikTok are also airing on Fox Business Network during commercial breaks.)

Scott also accused Ramaswamy of being ‘bought’ by China. He was likely referencing Ramaswamy's company, Roivant Sciences, announcing 5-years ago that it was partnering with China state-owned investment company CITIC Group Corp

And Pence had a similar, pointed attack: “I'm glad Vivek pulled out of his business deal in 2018 in China -- that must have been about the time you decided to start voting in presidential elections."

It’s worth noting that Haley criticized Trump too on this front, in that case for not pursuing China aggressively enough on a host of issues: “This is where President Trump went wrong.”

– ABC News’ Kendall Ross, Libby Cathey, Soorin Kim, Abby Cruz, Nicholas Kerr, and Oren Oppenheim